A good article was written on this stuff by Anthony Roberts. To sum up he says this stuff sucks for boosting testosterone and their are about 1,000 other things that work better.

Quote from Roberts...

"As far as testosterone boosters go, DAA is a real loser – you need to take a ton and it hardly elevates testosterone. As a testosterone booster, it really, really sucks."

http://www.anthonyroberts.co.za/2010...-testosterone/